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Interleukin-2 Receptor, Serum/Plasma — Mass Concentration

Published: August 9, 2026Updated: August 16, 2026

A blood test measuring the amount of soluble interleukin-2 receptor, a marker that can be increased when immune cells are activated.

Quick summary

["This specialized blood test can help evaluate immune activation when used with symptoms, examination findings, and other laboratory results."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
55926-0
Short code
Il2RecepA SerPl-mCnc
Synonyms
Il2RecepA SerPl-mCnc
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This test measures the amount of soluble interleukin-2 receptor (IL-2R) in serum or plasma. IL-2R is released from activated immune cells, so its level may reflect the degree of immune-system activity.

Why might I need this test?

This test may be ordered in selected cases of unexplained immune activation, persistent symptoms, or a suspected lymphoproliferative disorder. It is generally interpreted together with medical findings and other tests because an abnormal result is not specific to one condition.

How is the test performed?

A blood sample is collected, and the laboratory measures IL-2R in the serum or plasma portion. The specific laboratory method is not included in the test slug.

How do I prepare for the test?

No special preparation is usually required. Follow any instructions provided by your healthcare professional, and tell the laboratory if you have a bleeding disorder or take blood-thinning medicines.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Interleukin-2 Receptor (IL-2R)

Frequently asked questions

Is this the same as a routine blood count?
No. This is a specialized measurement of soluble IL-2R, while a routine blood count measures blood-cell numbers and other basic features.
Does an elevated result mean I have cancer?
No. Elevated IL-2R can have several causes, including infections and inflammatory conditions, so additional evaluation is usually needed.
Is there a normal range for this test?
Reference ranges can vary by laboratory and testing method. Your healthcare professional should interpret the result using the range supplied by the performing laboratory.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy